The weather observed at BOSTON, MA (KBOS) at 04:54 AM EDT was: The skies were cloudy. Temperature: 69F ( 21C) Dewpoint: 66F ( 19C) Relative Humidity: 90% Winds from the SW (210 degs) at 5 mph. Pressure: 1018.9 millibars. Altimeter:30.09 inches of mercury. The prevailing visibility was 10 miles.